key|keys

她是国际艺术界的关键人物。

She was a ___key figure in the international art world.

这是解决这个问题的关键因素。

This is a ___key factor in tackling the problem.

我在会议中没有问一个关键问题。

I didn't ask a ___key question during the meeting.

我有家里的钥匙和车钥匙。

I have ___keys for my house and my car.

钢琴键由象牙或塑料制成。

The piano ___keys are made of ivory or plastic.